Improved Wiper Blade for Printer Roller

A blade assembly of a waste catchment system for a roller, the blade assembly comprising a support plate for attachment to a tray of the waste catchment system and a blade holder, the blade holder configured to receive a blade having a longitudinal axis and a free edge extending in the direction of the longitudinal axis and adapted to engage with the roller to be cleaned, wherein the blade holder is configured to receive and retain the blade, the blade being removably attachable to the blade holder, and wherein one of the blade holder and blade includes a channel and the other of the blade holder and blade includes a protrusion configured to be seated in and retained within the channel, characterised in that there is a clearance fit between the channel and the protrusion.